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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories are stated at the lower of standard cost (which approximates actual cost determined using the first-in, first-out cost method) or market, and consist of the following (in thousands):

 
June 30,
2017
 
December 31,
2016
Raw materials
$
4,666

 
$
5,049

Finished goods
8,560

 
10,016

Reserves for excess, obsolete, and slow moving inventories and valuation reserves
$
(5,325
)
 
$
(5,596
)
Inventories, net
$
7,901

 
$
9,469